EP1883486B1 - Tool-holder chuck for equipping a rotating machine, in particular of the impact wrench type - Google Patents
Tool-holder chuck for equipping a rotating machine, in particular of the impact wrench type Download PDFInfo
- Publication number
- EP1883486B1 EP1883486B1 EP06764682A EP06764682A EP1883486B1 EP 1883486 B1 EP1883486 B1 EP 1883486B1 EP 06764682 A EP06764682 A EP 06764682A EP 06764682 A EP06764682 A EP 06764682A EP 1883486 B1 EP1883486 B1 EP 1883486B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- rotating part
- tooth
- jaws
- chuck according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/1207—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
- B23B31/123—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis with locking arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/1207—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
- B23B31/1238—Jaws movement actuated by a nut with conical screw-thread
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/52—Stabilizers
- A61K2800/522—Antioxidants; Radical scavengers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/38—Keyless chucks for hand tools
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/17—Socket type
- Y10T279/17615—Obliquely guided reciprocating jaws
Definitions
- the present invention relates to a tool chuck for the equipment of a rotating machine, in particular of the "impact wrench” type.
- a chuck mounted on the shaft of a rotating machine is intended to achieve the attachment of a tool, such as a drill if it is a drilling tool.
- Fixing the tool on the mandrel is commonly done by means of three jaws converging forward, driven and guided by different means in the mandrel, so that the axial movement of the jaws forward is translated by bringing them together to achieve the clamping of the tool, while the rearward movement of the jaws is accompanied by a loosening of the tool.
- a mandrel of the aforementioned type is generally equipped with a central piece which has on the one hand a rear part intended to be fixed to the rotating machine and on which is mounted a rear ring, and on the other hand a front part to which are associated jaws, and which is surrounded by a clamping ring.
- the rear ring and the clamping ring are intended to allow a user to operate the mandrel, by maintaining the rear ring and rotational actuation of the clamping ring.
- the jaws have a threaded portion, internally or externally, which can be rotated either by a thread of the central piece, the latter being actuated by the ring, or by a peripheral nut which is driven by the clamping ring. .
- impact wrench Some specific rotating machines, called “impact wrench” have the particularity of rotating their spindle by a system generating radial shocks on the spindle. Such an effect makes it possible to obtain very high clamping and loosening powers.
- screw sockets and other bits are mounted directly or using adapters on the square spindle of the machine.
- the object of the invention is therefore to provide a mandrel of the aforementioned type capable of offering the usual functions of a mandrel, on this type of machine, and not to be loosened regardless of the direction of rotation.
- the invention is realized with a tool chuck for the equipment of a rotary machine, in particular of the "impact key” type according to the first claim.
- the machine exerts on the mandrel radial shocks at a given frequency to the right.
- the rotating part and the ring are already a contact in the direction of tightening of the mandrel.
- the inertia of the ring therefore directly accentuates the clamping effect of the mandrel.
- the elastic means are arranged between a tooth of the ring and a tooth of the rotating part and, for example, connect said teeth.
- the elastic means may comprise a spring having the shape of a portion of a circle, a first end of which is fixed to a tooth of the ring and a second end of which is fixed to a tooth of the rotating part.
- the ring and the rotating part each have three teeth substantially evenly distributed along their inner face, respectively outer, the ring being mounted around the rotating part so that each tooth of the ring is placed between two teeth of the rotating part.
- the second end of the spring can be fixed on the tooth of the rotating part located immediately downstream of the tooth of the ring on which the first end of the spring is fixed, relative to the first direction of rotation.
- the teeth of the ring and the rotating part may each have a substantially flat and radial surface forming a stop surface, said faces being intended to cooperate.
- the ring has a mass of between 5 and 20% of the total mass of the mandrel, even between 5 and 15%, or even between 7 and 12%.
- the tooth of the rotating part is formed by the interruption of a circumferential recess formed in said rotating part.
- the jaws are guided in translation in housings formed in the central body part, said jaws converging towards the front and having a thread on their outer face, and in that the rotating part consists of a nut having an internal thread cooperating with the thread of the jaws.
- the jaws are guided in translation in housings formed in the rotating part forming a body, the jaws converging towards the front and having a thread on their inner face, the front part of the central part being threaded. and cooperating with the threading of the jaws.
- the mandrel 1 comprises a central piece here forming a body 2, of generally cylindrical shape and axis 3.
- the rear portion 4 of the body 2 comprises an orifice 5 intended to allow the introduction of a spindle 6 of a rotating machine such as a drill.
- the spindle 6 is of square section.
- the front portion 7 of the body 2 comprises a longitudinal bore 8 into which is introduced to be introduced a tool such as a drill, and three housings 9 converging forward, each receiving a jaw 10 and allowing its translation guide.
- the jaws 10 have an external thread 11.
- the mandrel 1 also comprises a substantially cylindrical rear ring 12, engaged around the rear portion 4 of the body 2 substantially coaxially, and secured thereto by any appropriate means (for example by a system of flats and the engagement of a bead in an annular groove).
- a nut 13 is engaged around the jaws 10, substantially coaxially with the body 2.
- the nut 13 has an internal thread 14 cooperating with the external thread 11 of the jaws 10, to allow the jaws 10 to move to the clamping position or loosened according to the direction of rotation of the nut 13.
- the nut 13 is substantially cylindrical, of small length relative to its diameter and to the length of the body 2.
- the nut 13 comprises a crown-shaped rear portion 15 and a front portion having three circumferential recesses 16 spaced apart. others.
- Three teeth 17 are thus defined, extending substantially radially outwardly of the nut 13, the free end 18 of the teeth 17 being situated in the extension of the rear portion 15 of the nut 13, and forming with it. the outer face 19 of the nut 13.
- the teeth 17 are evenly distributed around the periphery of the nut 13.
- Each tooth 17 is delimited by two radial faces 20, and covers an angle of about 20 to 30 °.
- each tooth 17 comprises an orifice 21 made substantially axially from its front face 22, which is orthogonal to the axis of the nut 13.
- the nut 13 is mounted as a rear stop on the body 2.
- a steel washer 23 and a ball cage 24 are interposed between the nut 13 and the body 2.
- a metal nose 25 is mounted on the body 2 in front of the nut 13, thus making it possible to maintain the nut 13 axially.
- the metal nose 25 is itself locked axially forwards by a rod 26 engaged in a groove. of the front part 7 of the body 2.
- the mandrel 1 also comprises a substantially cylindrical clamping ring 27, mounted around the nut 13 substantially coaxially, and locked in rotation rearwardly by the rear ring 12 and forwardly through the metal nose 25.
- ring 27 has a knurling 28 on its outer face to facilitate its handling by a user.
- the ring 27 comprises, in the front part, three teeth 29 projecting from its inner face 30 substantially radially and inwardly.
- the teeth 29 are substantially evenly distributed circumferentially along the inner face 30.
- Each tooth 29 is delimited by two radial faces 31 and covers an angle of approximately 40 to 50 °.
- each tooth 29 comprises an orifice 32 made substantially axially from its front face 33, which is orthogonal to the axis of the ring 27.
- the ring 27 is mounted around the nut 13 so that each of its teeth 29 is placed between two teeth 17 of the nut 13.
- the height of the teeth 29 is such that when the ring 27 is mounted around the nut 13, the free end 34 of a tooth 29 is located near, but with clearance, the bottom 35 of the recess 16 corresponding. In this mounted position, the free end 18 of the teeth 17 is located near, but with clearance, the inner face 30 of the ring 27.
- the ring 27 has a significant moment of inertia with respect to the axis 3 of the body 2, obtained by a large mass.
- the mass of the ring 27 is between 40 and 50 g for a total mass of the mandrel 1 of the order of 400 g.
- the mandrel 1 comprises a spring 36 in the form of a portion of a circle, covering for example an angle of between 250 and 300 °.
- a first end 37 of the spring 36 is fixed in the orifice 32 of a tooth 29 of the ring 27, and the second end 38 of the spring 36 is fixed in the orifice 21 of a tooth 17 of the nut 13 located immediately downstream with respect to the tightening direction.
- a user For tightening or loosening of a tool in the bore 8 of the body 2 of the mandrel 1, a user holds the rear ring 12 with one hand and, with the other hand, actuates the ring 27 in rotation with respect to the rear ring 12. Thus, it causes the rotation of the nut 13 due to the cooperation between the teeth 17 and 29. As a result, by the cooperation between the external thread 11 of the jaws 10 and the internal thread 14 of the nut 13, the jaws 10 are moved in the housings 9 of the body 2.
- the jaws 10 are moved to their clamping position, where they project towards the front of the mandrel 1 and brought together from each other so as to hold the tool clamped together, or to a loosened position, where they are retracted at least partially inside the mandrel 1 and spaced from each other, the tool can then be removed chuck 1.
- the spindle 6 When the spindle 6 turns to the right, which corresponds to the tightening direction, it drives the body 2 in rotation to the right ( figure 5 , arrow R1), and the nut 13 via the jaws 10.
- the downstream radial face 20 (with respect to the direction R1) of each tooth 17 of the nut 13 is in contact with the upstream radial face 31 of a tooth 29 of the ring 27. Accordingly, the rotation to the right of the nut 13 causes the rotation to the right of the ring 27.
- the spring 36 In this configuration, the spring 36 is in the rest position or slightly tensioned.
- the spindle 6 When the spindle 6 turns to the left, which corresponds to the loosening direction, it causes the body 2 to rotate to the left ( figure 6 , arrow R2) and, consequently, the jaws 10 engaged in the housings 9 of the body 2.
- the nut 13 By cooperation between the internal threads 14 of the nut 13 and outer 11 of the jaws 10, the nut 13 initiates a rotation to the left which can not continue beyond a certain angle of rotation due to the progressive loosening of the jaws 10.
- the ring 27 does not follow the rotation to the left of the nut 13, the angular difference between the teeth 17, 29 which were in contact in the case of the rotation to the right (R1) increases, and the spring 36 is stretched, thus storing the energy that will be used for tightening.
- the mass of the ring 27 (or more generally its moment of inertia with respect to the axis 3 of the body 2), the stiffness of the spring 36 and the friction between the ring 27 and the nut 13 must be carefully selected to allow causing a sufficient delay in rotation of the ring 27 relative to the nut 13 and a sufficient impact of the teeth 29 on the teeth 17 to allow the tightening of the jaws 10.
- the elastic means could for example be formed of a compressible foam disposed between two adjacent teeth of the ring and the rotating part.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Description
La présente invention concerne un mandrin porte-outil pour l'équipement d'une machine tournante, notamment du type « clé à choc ».The present invention relates to a tool chuck for the equipment of a rotating machine, in particular of the "impact wrench" type.
Un mandrin monté sur l'arbre d'une machine tournante vise à réaliser la fixation d'un outil, tel qu'un foret s'il s'agit d'un outil de perçage. La fixation de l'outil sur le mandrin est couramment réalisée par l'intermédiaire de trois mors convergeant vers l'avant, entraînés et guidés par différents moyens ménagés dans le mandrin, de telle sorte que le déplacement axial des mors vers l'avant se traduit par un rapprochement de ceux-ci en vue de réaliser le serrage de l'outil, tandis que le déplacement vers l'arrière des mors s'accompagne d'un desserrage de l'outil.A chuck mounted on the shaft of a rotating machine is intended to achieve the attachment of a tool, such as a drill if it is a drilling tool. Fixing the tool on the mandrel is commonly done by means of three jaws converging forward, driven and guided by different means in the mandrel, so that the axial movement of the jaws forward is translated by bringing them together to achieve the clamping of the tool, while the rearward movement of the jaws is accompanied by a loosening of the tool.
Un mandrin du type précité est en général équipé d'une pièce centrale qui présente d'une part une partie arrière destinée à être fixée à la machine tournante et sur laquelle est montée une bague arrière, et d'autre part une partie avant à laquelle sont associés les mors, et qui est entourée d'une bague de serrage.A mandrel of the aforementioned type is generally equipped with a central piece which has on the one hand a rear part intended to be fixed to the rotating machine and on which is mounted a rear ring, and on the other hand a front part to which are associated jaws, and which is surrounded by a clamping ring.
La bague arrière et la bague de serrage ont pour but de permettre à un utilisateur d'actionner le mandrin, par maintien de la bague arrière et actionnement en rotation de la bague de serrage. A cet effet, les mors possèdent une partie filetée, intérieurement ou extérieurement, pouvant être entraînée en rotation soit par un filetage de la pièce centrale, cette dernière étant actionnée par la bague, soit par un écrou périphérique qui est entraîné par la bague de serrage.The rear ring and the clamping ring are intended to allow a user to operate the mandrel, by maintaining the rear ring and rotational actuation of the clamping ring. For this purpose, the jaws have a threaded portion, internally or externally, which can be rotated either by a thread of the central piece, the latter being actuated by the ring, or by a peripheral nut which is driven by the clamping ring. .
Un autre mandrin connu dans l'art est celui du brevet
Certaines machines tournantes spécifiques, dites « clé à choc », présentent la particularité d'entraîner en rotation leur broche par un système générant des chocs radiaux sur la broche. Un tel effet permet d'obtenir des puissances de serrage et de desserrage très élevées. Habituellement, les douilles de vissage et autres embouts sont montés directement ou à l'aide d'adaptateurs sur la broche carrée de la machine.Some specific rotating machines, called "impact wrench" have the particularity of rotating their spindle by a system generating radial shocks on the spindle. Such an effect makes it possible to obtain very high clamping and loosening powers. Usually, the screw sockets and other bits are mounted directly or using adapters on the square spindle of the machine.
Or, pour certaines applications, il est souhaitable d'équiper la broche de la machine « clé à choc » d'un mandrin sur lequel est fixé l'embout formant outil. Mais sur ce type de machines, un mandrin sans clé classique, même équipé d'un système de verrouillage, s'ouvre immédiatement dans le cas d'une utilisation en rotation à gauche. Ce phénomène est directement lié aux chocs radiaux que génère la machine.However, for some applications, it is desirable to equip the spindle of the machine "impact wrench" of a mandrel on which is fixed the tool end. But on this type of machine, a conventional keyless chuck, even equipped with a locking system, opens immediately in the case of use in rotation to the left. This phenomenon is directly related to radial shocks generated by the machine.
Le but de l'invention est donc de fournir un mandrin du type précité capable d'offrir les fonctionnalités habituelles d'un mandrin, sur ce type de machine, et de ne pas subir de desserrage quel que soit le sens de rotation.The object of the invention is therefore to provide a mandrel of the aforementioned type capable of offering the usual functions of a mandrel, on this type of machine, and not to be loosened regardless of the direction of rotation.
A cet effet, l'invention se réalise avec un mandrin porte-outil pour l'équipement d'une machine tournante, notamment du type «clé à choc» selon la première revendication.For this purpose, the invention is realized with a tool chuck for the equipment of a rotary machine, in particular of the "impact key" type according to the first claim.
Ainsi, lorsque la pièce centrale tourne dans le premier sens (sens de serrage, généralement à droite), la machine exerce sur le mandrin des chocs radiaux à une fréquence donnée vers la droite. La pièce tournante et la bague sont déjà un contact dans le sens du serrage du mandrin. L'inertie de la bague accentue donc directement l'effet de serrage du mandrin.Thus, when the central part rotates in the first direction (clamping direction, generally on the right), the machine exerts on the mandrel radial shocks at a given frequency to the right. The rotating part and the ring are already a contact in the direction of tightening of the mandrel. The inertia of the ring therefore directly accentuates the clamping effect of the mandrel.
A l'inverse, lorsque la pièce centrale tourne dans le deuxième sens (sens de serrage, généralement à gauche), la machine exerce sur le mandrin des chocs radiaux à une fréquence donnée vers la gauche. Compte tenue de son inertie, la bague a tendance à ne pas suivre le mouvement de rotation ainsi généré. En conséquence, les moyens élastiques qui relient la bague à la pièce tournante sont mis en tension, alors que l'angle de battement relatif entre ces deux pièces se réduit. Entre deux chocs générés par la machine, les moyens élastiques ainsi tendus reviennent vers leur position de repos et restituent leur énergie à la bague qui vient alors frapper la pièce tournante dans le sens du serrage, ce qui a pour effet de resserrer les mors et d'éviter toute ouverture intempestive du mandrin.Conversely, when the central part rotates in the second direction (clamping direction, usually left), the machine exerts on the mandrel radial shocks at a given frequency to the left. Given its inertia, the ring tends not to follow the rotation movement thus generated. As a result, the elastic means connecting the ring to the rotating part are tensioned, while the relative beat angle between these two parts is reduced. Between two shocks generated by the machine, the elastic means thus stretched back to their rest position and return their energy to the ring which then hit the rotating part in the direction of tightening, which has the effect of tightening the jaws and d avoid any inadvertent opening of the chuck.
Selon une réalisation possible, les moyens élastiques sont disposés entre une dent de la bague et une dent de la pièce tournante et, par exemple, relient lesdites dents.According to one possible embodiment, the elastic means are arranged between a tooth of the ring and a tooth of the rotating part and, for example, connect said teeth.
Les moyens élastiques peuvent comprendre un ressort présentant la forme d'une portion de cercle, dont une première extrémité est fixée sur une dent de la bague et dont une deuxième extrémité est fixée sur une dent de la pièce tournante.The elastic means may comprise a spring having the shape of a portion of a circle, a first end of which is fixed to a tooth of the ring and a second end of which is fixed to a tooth of the rotating part.
Il peut être prévu que la bague et la pièce tournante présentent chacune trois dents sensiblement équiréparties le long de leur face intérieure, respectivement extérieure, la bague étant montée autour de la pièce tournante de sorte que chaque dent de la bague soit placée entre deux dents de la pièce tournante.It can be provided that the ring and the rotating part each have three teeth substantially evenly distributed along their inner face, respectively outer, the ring being mounted around the rotating part so that each tooth of the ring is placed between two teeth of the rotating part.
Dans ce cas, la deuxième extrémité du ressort peut être fixée sur la dent de la pièce tournante située immédiatement en aval de la dent de la bague sur laquelle la première extrémité du ressort est fixée, par rapport au premier sens de rotation.In this case, the second end of the spring can be fixed on the tooth of the rotating part located immediately downstream of the tooth of the ring on which the first end of the spring is fixed, relative to the first direction of rotation.
Les dents de la bague et de la pièce tournante peuvent présenter chacune une face sensiblement plane et radiale formant surface de butée, lesdites faces étant destinées à coopérer.The teeth of the ring and the rotating part may each have a substantially flat and radial surface forming a stop surface, said faces being intended to cooperate.
Selon une réalisation possible, la bague possède une masse comprise entre 5 et 20 % de la masse totale du mandrin, voire entre 5 et 15 %, voire encore entre 7 et 12 %.According to one possible embodiment, the ring has a mass of between 5 and 20% of the total mass of the mandrel, even between 5 and 15%, or even between 7 and 12%.
On peut prévoir que la dent de la pièce tournante soit formée par l'interruption d'un évidement circonférentiel ménagé dans ladite pièce tournante.It can be provided that the tooth of the rotating part is formed by the interruption of a circumferential recess formed in said rotating part.
Selon un premier mode de réalisation, les mors sont guidés en translation dans des logements ménagés dans la pièce centrale formant corps, lesdits mors convergeant vers l'avant et présentant un filetage sur leur face extérieure, et en ce que la pièce tournante est constituée d'un écrou présentant un filetage intérieur coopérant avec le filetage des mors.According to a first embodiment, the jaws are guided in translation in housings formed in the central body part, said jaws converging towards the front and having a thread on their outer face, and in that the rotating part consists of a nut having an internal thread cooperating with the thread of the jaws.
Selon un deuxième mode de réalisation, les mors sont guidés en translation dans des logements ménagés dans la pièce tournante formant un corps, les mors convergeant vers l'avant et présentant un filetage sur leur face intérieure, la partie avant de la pièce centrale étant filetée et coopérant avec le filetage des mors.According to a second embodiment, the jaws are guided in translation in housings formed in the rotating part forming a body, the jaws converging towards the front and having a thread on their inner face, the front part of the central part being threaded. and cooperating with the threading of the jaws.
On décrit à présent, à titre d'exemple non limitatif, une forme de réalisation possible de l'invention, en référence aux figures annexées :
- La
figure 1 est une vue en perspective éclatée du mandrin selon l'invention ; - La
figure 2 en est une vue en coupe longitudinale; - La
figure 3 est une vue en perspective de l'écrou; - La
figure 4 est une vue en perspective de la bague ; - Les
figures 5 et 6 sont des vues en coupe selon la ligne AA de lafigure 2 , lorsque la pièce centrale tourne à droite, respectivement à gauche.
- The
figure 1 is an exploded perspective view of the mandrel according to the invention; - The
figure 2 is a longitudinal sectional view; - The
figure 3 is a perspective view of the nut; - The
figure 4 is a perspective view of the ring; - The
Figures 5 and 6 are sectional views along line AA of thefigure 2 when the center piece turns to the right, respectively to the left.
Le mandrin 1 comprend une pièce centrale formant ici un corps 2, de forme générale cylindrique et d'axe 3. La partie arrière 4 du corps 2 comprend un orifice 5 destiné à permettre l'introduction d'une broche 6 d'une machine tournante telle qu'une perceuse. Dans la réalisation représentée, la broche 6 est de section carrée. La partie avant 7 du corps 2 comprend un alésage 8 longitudinal dans lequel est destiné à être introduit un outil tel qu'un foret, ainsi que trois logements 9 convergeant vers l'avant, recevant chacun un mors 10 et permettant son guidage en translation. Les mors 10 présentent un filetage extérieur 11.The
Le mandrin 1 comprend également une bague arrière 12, sensiblement cylindrique, engagée autour de la partie arrière 4 du corps 2 de façon sensiblement coaxiale, et rendue solidaire de celle-ci par tout moyen approprié (par exemple par un système de méplats et l'engagement d'un bourrelet dans une gorge annulaire).The
Un écrou 13 est engagé autour des mors 10, sensiblement coaxialement au corps 2. L'écrou 13 présente un filetage intérieur 14 coopérant avec le filetage extérieur 11 des mors 10, pour permettre le déplacement des mors 10 vers la position de serrage ou desserrée suivant le sens d'entraînement en rotation de l'écrou 13.A
Comme illustré sur la
L'écrou 13 est monté en butée arrière sur le corps 2. Afin de faciliter sa rotation, une rondelle en acier 23 et une cage à billes 24 sont interposées entre l'écrou 13 et le corps 2.The
Un nez métallique 25 est monté sur le corps 2 en avant de l'écrou 13, permettant ainsi de maintenir axialement l'écrou 13. Le nez métallique 25 est lui-même bloqué axialement vers l'avant par un jonc 26 engagé dans une gorge de la partie avant 7 du corps 2.A
Le mandrin 1 comprend également une bague 27 servant au serrage, sensiblement cylindrique, montée autour de l'écrou 13 sensiblement coaxialement, et bloquée en rotation vers l'arrière par la bague arrière 12 et vers l'avant par le nez métallique 25. La bague 27 présente un moletage 28 sur sa face extérieure destiné à faciliter sa manipulation par un utilisateur.The
La bague 27 comprend, en partie avant, trois dents 29 faisant saillie de sa face intérieure 30 sensiblement radialement et vers l'intérieur. Les dents 29 sont sensiblement équiréparties de façon circonférentielle le long de la face intérieure 30. Chaque dent 29 est délimitée par deux faces radiales 31 et couvre un angle d'environ 40 à 50°. De plus, chaque dent 29 comprend un orifice 32 pratiqué sensiblement axialement depuis sa face avant 33, laquelle est orthogonale à l'axe de la bague 27.The
La bague 27 est montée autour de l'écrou 13 de sorte que chacune de ses dents 29 soit placée entre deux dents 17 de l'écrou 13. La hauteur des dents 29 est telle que, lorsque la bague 27 est montée autour de l'écrou 13, l'extrémité libre 34 d'une dent 29 est située à proximité, mais avec jeu, du fond 35 de l'évidement 16 correspondant. Dans cette position montée, l'extrémité libre 18 des dents 17 est située à proximité, mais avec jeu, de la face intérieure 30 de la bague 27.The
La bague 27 présente un moment d'inertie important par rapport à l'axe 3 du corps 2, obtenu par une masse importante. A titre d'exemple, la masse de la bague 27 est comprise entre 40 et 50 g pour une masse totale du mandrin 1 de l'ordre de 400 g.The
Enfin, le mandrin 1 comprend un ressort 36 en forme de portion de cercle, couvrant par exemple un angle compris entre 250 et 300°. Une première extrémité 37 du ressort 36 est fixée dans l'orifice 32 d'une dent 29 de la bague 27, et la deuxième extrémité 38 du ressort 36 est fixée dans l'orifice 21 d'une dent 17 de l'écrou 13 située immédiatement en aval par rapport au sens de serrage.Finally, the
Pour le serrage ou le desserrage d'un outil dans l'alésage 8 du corps 2 du mandrin 1, un utilisateur tient la bague arrière 12 d'une main et, avec l'autre main, actionne la bague 27 en rotation par rapport à la bague arrière 12. Ainsi, il provoque la rotation de l'écrou 13 du fait de la coopération entre les dents 17 et 29. En conséquence, par la coopération entre le filetage extérieur 11 des mors 10 et le filetage intérieur 14 de l'écrou 13, les mors 10 sont déplacés dans les logements 9 du corps 2. Selon le sens de rotation de la bague 27, les mors 10 sont déplacés vers leur position de serrage, où ils sont saillants vers l'avant du mandrin 1 et rapprochés les uns des autres de façon à pouvoir maintenir l'outil serré entre eux, ou vers une position desserrée, où ils sont rétractés au moins partiellement à l'intérieur du mandrin 1 et écartés les uns des autres, l'outil pouvant alors être ôté du mandrin 1.For tightening or loosening of a tool in the
On se réfère à présent aux
Lorsque la broche 6 tourne à droite, ce qui correspond au sens de serrage, elle entraîne le corps 2 en rotation à droite (
Lorsque la broche 6 tourne à gauche, ce qui correspond au sens de desserrage, elle entraîne le corps 2 en rotation à gauche (
Puisqu'il existe un écart angulaire entre la face radiale 20 aval (par rapport au sens R2) de chaque dent 17 de l'écrou 13 et la face radiale 31 amont de la dent 29 correspondante de la bague 27, l'écrou 13 ne peut entraîner la bague 27 par l'intermédiaire de la coopération directe entre les dents. En outre, du fait de l'importante inertie en rotation de la bague 27, le ressort 36, dont la deuxième extrémité est entraînée en rotation selon R2 par la dent 17 de l'écrou 13 à laquelle il est fixé, ne permet pas non plus un entraînement simultané de la bague 27 et de l'écrou 13.Since there is an angular difference between the downstream radial face (relative to the R2 direction) of each
La bague 27 ne suivant pas la rotation à gauche de l'écrou 13, l'écart angulaire entre les dents 17, 29 qui étaient en contact dans le cas de la rotation à droite (R1) augmente, et le ressort 36 se tend, emmagasinant ainsi l'énergie qui servira au resserrage.The
Pendant le moment où le mouvement à gauche de la machine tournante est arrêté (fonctionnement par chocs radiaux), et sous l'effet de la force de rappel du ressort 36, la bague 27 est brusquement entraînée en rotation à gauche. Ses dents 29 « rattrapent » les dents 17 de l'écrou 13 qu'elles viennent heurter avec un choc qui provoque la rotation de l'écrou 13 vers la gauche par rapport au corps 2, et donc le resserrage des mors 10. Les pièces constitutives du mandrin 1 se retrouvent alors dans la position de la
L'homme du métier comprendra que la masse de la bague 27 (ou plus généralement son moment d'inertie par rapport à l'axe 3 du corps 2), la raideur du ressort 36 et le frottement entre la bague 27 et l'écrou 13 doivent être judicieusement choisis pour permettre de provoquer un retard suffisant en rotation de la bague 27 par rapport à l'écrou 13 et un choc suffisant des dents 29 sur les dents 17 pour permettre le resserrage des mors 10.Those skilled in the art will understand that the mass of the ring 27 (or more generally its moment of inertia with respect to the
Il va de soi que l'invention n'est pas limitée à la forme de réalisation décrite ci-dessus à titre d'exemple mais qu'elle en embrasse au contraire toutes les variantes de réalisation qui tombent au sein de la première revendication.It goes without saying that the invention is not limited to the embodiment described above by way of example but that it encompasses all the variants that fall within the first claim.
En variante, les moyens élastiques pourraient par exemple, être formés d'une mousse compressible disposée entre deux dents adjacentes de la bague et de la pièce tournante.Alternatively, the elastic means could for example be formed of a compressible foam disposed between two adjacent teeth of the ring and the rotating part.
Claims (11)
- A tool holder chuck for equipping a rotating machine, notably of the « impact key » type comprising:- a central part (2) having an axis (3) and including a rear portion (4) intended to be attached on a driving spindle of the rotating machine and a front portion (7) with which jaws (10) are associated, said jaws (10) being displaceable relatively to the central part (2) between a position for tightening the tool and a loosening position;- a rotating part (13) which, placed around the central part (2), and associated with the jaws (10), is intended to produce the displacement of the jaws (10), with view to tightening or loosening the tool, said rotating part (13) being, during operation, interdependent in rotation with the central part (2) when the latter rotates in a first direction (R1), corresponding to the tightening direction;- a ring (27) mounted around the rotating part (13), with view to achieving driving of said rotating part (13),- the ring (27) being mounted around the rotating part (13) so as to be rotationally mobile along a limited angular amplitude;
characterized:- in that the rotating part (13) comprises at least one tooth (17), extending substantially radially outwards, intended to cooperate with a tooth (29) protruding from the ring (27) substantially radially inwards, in order to be able to drive the ring (27) into rotation in the first direction (R1);- and in that elastic means (36) are positioned between the rotating part (13) and the ring (27), the ring (27) having a sufficiently large moment of inertia relatively to the axis (3) of the central part (2) so that, when the central part (2) rotates in a second direction (R2), corresponding to the loosening direction, the ring (27) does not initially follow the rotary movement in the second direction (R2) initiated by the rotating part (13), thereby causing tensioning or compression of the elastic means (36) and then, under the effect of the return force of the elastic means (36), the tooth (29) of the ring (27) will hit the tooth (17) of the rotating part (13) causing tightening of the jaws (10). - The chuck according to claim 1, characterized in that the elastic means (36) are positioned between a tooth (29) of the ring (27) and a tooth (17) of the rotating part (13).
- The chuck according to claim 1 or 2, characterized in that the elastic means (36) connect a tooth (29) of the ring (27) and a tooth (17) of the rotating part (13).
- The chuck according to one of claims 1 to 3, characterized in that the elastic means comprise a spring (36) having the shape of a circular portion, a first end (37) of which is attached on a tooth (29) of the ring (27) and a second end (38) of which is attached on a tooth (17) of the rotating part (13).
- The chuck according to one of claims 1 to 4, characterized in that the ring (27) and the rotating part (13) each have three teeth (29, 17) substantially equally distributed along their inner (30), respectively outer (19) face, the ring (27) being mounted around the rotating part (13) so that each tooth (29) of the ring (27) is placed between two teeth (17) of the rotating part (13).
- The chuck according to claims 4 and 5, characterized in that the second end (38) of the spring (36) is attached on the tooth (17) of the rotating part (13) immediately located downstream from the tooth (29) of the ring (27) on which the first end (37) of the spring (36) is attached, relatively to the first direction of rotation (R1).
- The chuck according to one of claims 1 to 6, characterized in that the teeth (29, 17) of the ring (27) and of the rotating part (13) each have a substantially planar and radial face forming an abutment surface, said faces (31, 20) being intended to cooperate.
- The chuck according to one of claims 1 to 7, characterized in that the ring (27) has a mass is comprised between 5 and 20% of the total mass of the chuck (1).
- The chuck according to one of claims 1 to 8, characterized in that the tooth (17) of the rotary part (13) is formed by interruption of a circumferential recess (16) made in said rotating part (13).
- The chuck according to one of claims 1 to 9, characterized in that the jaws (10) are guided in translation in housings (9) made in the body-forming central part (2), said jaws (10) converging forwards and having a thread (11) on their outer face, and in that the rotating part consists of a nut (13) having an inner thread (14) cooperating with the thread (11) of the jaws (10).
- The chuck according to one of claims 1 to 9, characterized in that the jaws (10) are guided in translation in housings made in the body-forming rotating part (13), the jaws (10) converging forwards and having a thread on their outer face, the front portion of the central part (2) being threaded and cooperating with the thread of the jaws (10).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0505389A FR2886183B1 (en) | 2005-05-27 | 2005-05-27 | TOOL HOLDER CHUCK FOR THE EQUIPMENT OF A ROTATING MACHINE, IN PARTICULAR OF THE "SHOCK KEY" TYPE |
PCT/FR2006/001190 WO2006125918A2 (en) | 2005-05-27 | 2006-05-24 | Tool-holder chuck for equipping a rotating machine, in particular of the impact wrench type |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1883486A2 EP1883486A2 (en) | 2008-02-06 |
EP1883486B1 true EP1883486B1 (en) | 2012-12-19 |
Family
ID=35892567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06764682A Not-in-force EP1883486B1 (en) | 2005-05-27 | 2006-05-24 | Tool-holder chuck for equipping a rotating machine, in particular of the impact wrench type |
Country Status (8)
Country | Link |
---|---|
US (1) | US20090066039A1 (en) |
EP (1) | EP1883486B1 (en) |
JP (1) | JP4955664B2 (en) |
CN (1) | CN100522429C (en) |
ES (1) | ES2401291T3 (en) |
FR (1) | FR2886183B1 (en) |
TW (1) | TWI316009B (en) |
WO (1) | WO2006125918A2 (en) |
Families Citing this family (6)
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DE102009027223B4 (en) * | 2009-06-26 | 2022-01-13 | Robert Bosch Gmbh | Hand-held power tool with ratchet mechanism |
US10882119B2 (en) | 2013-03-14 | 2021-01-05 | Black & Decker Inc. | Chuck sleeve for power tool |
US10011006B2 (en) | 2013-08-08 | 2018-07-03 | Black & Decker Inc. | Fastener setting algorithm for drill driver |
WO2018068284A1 (en) * | 2016-10-14 | 2018-04-19 | Jacobs Chuck Manufacturing (Suzhou) Company, Ltd. | Chuck with slip protection |
JP7049929B2 (en) * | 2018-06-06 | 2022-04-07 | 株式会社マキタ | Power tools and electric vibration driver drills |
CN114488448B (en) * | 2022-03-08 | 2023-12-01 | 南方科技大学 | Multi-fiber packaging device and multi-fiber packaging method |
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-
2006
- 2006-05-24 EP EP06764682A patent/EP1883486B1/en not_active Not-in-force
- 2006-05-24 US US11/918,615 patent/US20090066039A1/en not_active Abandoned
- 2006-05-24 JP JP2008512877A patent/JP4955664B2/en not_active Expired - Fee Related
- 2006-05-24 ES ES06764682T patent/ES2401291T3/en active Active
- 2006-05-24 CN CNB2006800185425A patent/CN100522429C/en not_active Expired - Fee Related
- 2006-05-24 WO PCT/FR2006/001190 patent/WO2006125918A2/en not_active Application Discontinuation
- 2006-09-21 TW TW095134948A patent/TWI316009B/en not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
EP1883486A2 (en) | 2008-02-06 |
FR2886183B1 (en) | 2007-07-13 |
CN101184571A (en) | 2008-05-21 |
JP4955664B2 (en) | 2012-06-20 |
WO2006125918A3 (en) | 2007-01-25 |
TW200815147A (en) | 2008-04-01 |
CN100522429C (en) | 2009-08-05 |
ES2401291T3 (en) | 2013-04-18 |
US20090066039A1 (en) | 2009-03-12 |
WO2006125918A2 (en) | 2006-11-30 |
JP2008542036A (en) | 2008-11-27 |
FR2886183A1 (en) | 2006-12-01 |
TWI316009B (en) | 2009-10-21 |
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